KR20060129918A - Plasma display apparatus and driving method of plasma display panel - Google Patents

Abstract

A plasma display apparatus and a method of driving a plasma display panel(PDP) are provided to prevent erroneous discharge due to excessively high temperature and degradation of image quality by adjusting a sustain voltage period according to the temperature of the PDP. A plasma display apparatus includes a PDP(800), drivers(803,804), and a sustain pulse controller(801). The PDP includes plural scan and sustain electrodes. The drivers drive the scan and sustain electrodes. The sustain pulse controller controls the drivers and adjusts the duration of a sustain pulse, which is supplied to one of the scan and sustain electrodes during a sustain period. The sustain pulse controller increases the duration of the sustain pulse, when the temperature of the PDP is higher than an atmospheric temperature.

Description

Plasma Display Apparatus and Driving Method of Plasma Display Panel}

1 is a diagram showing the structure of a typical plasma display panel.

2 is a view for explaining an arrangement structure of electrodes in a typical plasma display panel.

3 is a diagram illustrating a method of implementing image gradation of a conventional plasma display panel.

4 is a view illustrating a driving waveform according to a driving method of a conventional plasma display panel.

FIG. 5 is a diagram for explaining in detail a sustain pulse supplied in a sustain period in a conventional driving waveform; FIG.

6 is a view for explaining a distribution change of wall charges according to temperature change in a plasma display panel operated with a driving waveform according to a conventional driving method.

7 is a view for explaining sustain light generated by a conventional sustain pulse when the temperature of the plasma display panel is high or low temperature.

8 is a diagram for explaining the structure of a plasma display device of the present invention;

9 is a view for explaining an embodiment of a method of driving a plasma display panel of the present invention.

FIG. 10 is a view for explaining an optical characteristic according to temperature by a driving waveform of FIG. 9; FIG.

Fig. 11 is a view for explaining an example of a method for setting a threshold temperature in the method for driving a plasma display panel of the present invention.

12 is a view for explaining an example of another method for setting a threshold temperature in the method for driving a plasma display panel of the present invention.

FIG. 13 is a view for explaining that a sustain pulse supplied to a scan electrode and a sustain pulse supplied to the sustain electrode overlap with each other in the driving method of the plasma display panel of the present invention; FIG.

14 is a diagram for explaining a period of a pair of sustain pulses that overlap.

<Explanation of symbols for the main parts of the drawings>

800: plasma display panel 801: sustain pulse control unit

802: data driver 803: scan driver

804: sustain drive unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and to a plasma display device and a method of driving the plasma display panel for improving a sustain pulse supplied in a sustain period in consideration of the temperature of the plasma display panel.

In general, a plasma display panel is a partition wall formed between a front panel and a rear panel to form one unit cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He) and An inert gas containing the same main discharge gas and a small amount of xenon is filled. When discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image. Such a plasma display panel has a spotlight as a next generation display device because of its thin and light configuration.

1 illustrates a structure of a general plasma display panel.

As shown in FIG. 1, a plasma display panel includes a front panel in which a plurality of sustain electrode pairs formed by pairing a scan electrode 102 and a sustain electrode 103 are arranged on a front glass 101 that is a display surface on which an image is displayed. The rear panel 110 on which the plurality of address electrodes 113 are arranged so as to intersect the plurality of sustain electrode pairs on the back glass 111 forming the back surface 100 and the rear surface is coupled in parallel with a predetermined distance therebetween. .

The front panel 100 is made of a scan electrode 102 and a sustain electrode 103, that is, a transparent electrode (a) formed of a transparent ITO material and a metal material to mutually discharge and maintain light emission of the cells in one discharge cell. The scan electrode 102 and the sustain electrode 103 provided as the bus electrode b are included in pairs. The scan electrode 102 and the sustain electrode 103 are covered by one or more upper dielectric layers 104 that limit the discharge current and insulate the electrode pairs, and to facilitate the discharge conditions on the upper dielectric layer 104 top surface. A protective layer 105 on which magnesium oxide (MgO) is deposited is formed.

The rear panel 110 is arranged such that a plurality of discharge spaces, that is, barrier ribs 112 of a stripe type (or well type) for forming discharge cells are maintained in parallel. In addition, a plurality of address electrodes 113 which perform address discharge to generate vacuum ultraviolet rays are arranged in parallel with the partition wall 112. On the upper side of the rear panel 110, R, G, and B phosphors 114 which emit visible light for image display during address discharge are coated. A lower dielectric layer 115 is formed between the address electrode 113 and the phosphor 114 to protect the address electrode 113.

In the plasma display panel having such a structure, a plurality of discharge cells are formed in a matrix arrangement. Such a discharge cell is formed at a point where the scan electrode or the sustain electrode intersects the above-described address electrode. The electrode arrangement for forming the plurality of discharge cells in a matrix array structure is as follows.

2 is a view for explaining an arrangement structure of electrodes in a general plasma display panel.

As shown in FIG. 2, in a typical plasma display panel 200, for example, scan electrodes Y ₁ to Yn and sustain electrodes Z ₁ to Zn are arranged side by side, and the address electrodes X ₁ to Xm intersect with each other. ) Is formed.

The driving apparatus of the plasma display panel for applying a predetermined driving signal to each of the electrodes of the plasma display panel 200 having the arrangement structure is connected. Accordingly, a driving signal is applied to the electrodes of the plasma display panel 200 by the driving device described above to implement an image.

A method of implementing image gradation in a general plasma display panel having such a structure is shown in FIG. 3.

3 is a diagram illustrating a method of implementing image grayscale of a conventional plasma display panel.

As shown in FIG. 3, in the conventional method of expressing a gray level of a plasma display panel, a frame is divided into several sub-fields having different emission counts, and each subfield is again divided into all cells. It is divided into a reset period (RPD) for initializing them, an address period (APD) for selecting a cell to be discharged, and a sustain period (SPD) for implementing gray scale according to the number of discharges. For example, when displaying an image with 256 gray levels, a frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8 as shown in FIG. 3, and eight subfields. Each of the SFs SF1 to SF8 is divided into a reset period, an address period, and a sustain period.

The reset period and the address period of each subfield are the same for each subfield. The address discharge for selecting the cell to be discharged is caused by the voltage difference between the address electrode X and the transparent electrode which is the scan electrode Y. The sustain period is increased at a rate of 2 ⁿ ( ^where n = 0, 1, 2, 3, 4, 5, 6, 7) in each subfield. As described above, since the sustain period is different in each subfield, the gray level of the image is expressed by adjusting the sustain period of each subfield, that is, the number of sustain discharges. Looking at the driving waveform according to the driving method of the plasma display panel as shown in FIG.

4 is a diagram illustrating a driving waveform according to a driving method of a conventional plasma display panel.

As shown in Fig. 4, the plasma display panel erases the reset period for initializing all the cells, the address period for selecting the cells to be discharged, the sustain period for maintaining the discharge of the selected cells, and the wall charges in the discharged cells. It is divided into an erase period for driving.

In the reset period, rising ramp pulses Ramp-up are simultaneously applied to the plurality of scan electrodes Y in the setup period. This rising ramp waveform causes weak dark discharge within the full discharge cells. By this setup discharge, positive wall charges are accumulated on the address electrode X and the sustain electrode Z, and negative wall charges are accumulated on the scan electrode Y.

In the setdown period, after the rising ramp pulse is supplied, the falling ramp waveform (Ramp-down) begins to fall from the positive voltage lower than the peak voltage of the rising ramp pulse and falls to a specific voltage level below the ground (GND) level voltage. By generating a weak erase discharge in the inside, the wall charges excessively formed in the scan electrode are sufficiently erased. By this set-down discharge Y, wall charges such that the address discharge can stably occur remain uniformly in the cells.

In the address period, the negative scan pulses are sequentially applied to the scan electrodes Y, and the positive data pulses are applied to the address electrodes X in synchronization with the scan pulses. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated in the reset period are added, address discharge is generated in the discharge cell to which the data pulse is applied. In the cells selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs is applied. The positive electrode voltage Vz is supplied to the sustain electrode Z so as to reduce the voltage difference between the scan electrode Y during the set down period and the address period so that erroneous discharge with the scan electrode Y does not occur.

In the sustain period, a sustain pulse Su is applied to at least one of the scan electrode Y and the sustain electrode Z. In the cell selected by the address discharge, the sustain voltage, that is, the display discharge, is generated between the scan electrode Y and the sustain electrode Z every time the sustain pulse is applied as the wall voltage and the sustain pulse in the cell are added.

In addition, after the sustain discharge is completed, in the erase period, a voltage of an erase ramp waveform (Ramp-ers) having a small pulse width and a low voltage level is supplied to the sustain electrode to erase the wall charge remaining in the cells of the full screen.

Looking at the sustain pulse supplied in the sustain period in the conventional drive waveform in more detail as shown in FIG.

5 is a view for explaining in detail the sustain pulse supplied in the sustain period in the conventional drive waveform.

Referring to FIG. 5, the sustain pulse supplied in the sustain period in the conventional driving waveform is applied to the scan electrode Y in a state in which the voltage of the ground level GND is applied to the sustain electrode Z as shown in FIG. 5. When the sustain voltage Vs is applied, sustain discharge by the scan electrode Y is generated. On the contrary, when the sustain voltage Vs is applied to the sustain electrode Z while the voltage of the ground level GND is applied to the scan electrode Y, the sustain discharge caused by the sustain electrode Z is generated. Such a sustain pulse is generally supplied to the scan electrode Y and the sustain electrode Z alternately.

Such a conventional sustain pulse rises in a state having a predetermined slope in a voltage rise period (ER-Up Time), that is, in a state in which ER-Up rises and also has a predetermined slope in a voltage fall period (ER-Down Time). descent. In other words, ER-Down. For example, the above-described voltage rising period is a period of rising from the ground level GND to the sustain voltage Vs as shown in FIG. 5, and the above-described voltage falling period falls from the sustain voltage Vs to the ground level GND. It is a period.

In addition, such a conventional sustain pulse has a holding time (W) of a predetermined sustain voltage (Vs).

Here, in the conventional sustain pulse, the above-described sustain time of the sustain voltage Vs is kept constant regardless of the temperature of the panel.

On the other hand, when the temperature of the plasma display panel rises excessively, the wall charges recombine with the space charges in the discharge cell, and thus the amount of wall charges in the discharge cell decreases. Referring to FIG. Same as

6 is a view for explaining a distribution change of wall charges according to temperature change in a plasma display panel operated with a driving waveform according to a conventional driving method.

Referring to FIG. 6, in a plasma display panel operated with a driving waveform according to a conventional driving method, when the temperature around the panel rises, for example, when the temperature of the space charge 601 and the wall charge 600 in the discharge cell is higher than room temperature, Since the recombination rate increases, the absolute amount of wall charge participating in the discharge decreases. As a result, erroneous discharge occurs when the temperature of the panel is high. That is, high temperature discharge is generated.

For example, when the panel temperature is high, the recombination ratio of the space charge 601 and the wall charge 600 increases in the address period, thereby decreasing the amount of the wall charge 600 participating in the address discharge, thereby reducing the address discharge. Make it unstable. In this case, the address discharge becomes more unstable because the order of addressing is backward, so that a sufficient time for recombination of the space charge 601 and the wall charge 600 is ensured. As a result, high temperature misdischarge occurs such that the magnitude of the sustain light generated by the conventional sustain pulse of FIG. 5 is reduced, or even the discharge cells that are turned on in the address period are turned off in the sustain period.

In addition, when the temperature of the panel is relatively low, the recombination ratio of the space charge 601 and the wall charge 600 is relatively reduced, so that the amount of wall charges in the discharge cell is excessively large. Accordingly, when the temperature of the panel is relatively low temperature, low temperature discharge such as excessively large size of the sustain light generated by the conventional sustain pulse of FIG. 5 or even poor bright point occurs.

As described above, the sustain light generated by the sustain pulse of the conventional driving waveform of FIG. 5 when the temperature of the plasma display panel is low or high temperature will be described with reference to FIG. 7.

7 is a view for explaining sustain light generated by a conventional sustain pulse when the temperature of the plasma display panel is high or low temperature.

Referring to FIG. 7, the conventional sustain pulse is maintained at a constant sustain time of the sustain voltage regardless of the temperature of the plasma display panel, and thus, when the panel temperature is relatively high or relatively low temperature. The magnitude of the sustain light generated by the sustain pulses varies.

For example, in the case where the length of the sustain time of the sustain voltage of the sustain pulse is kept constant as shown in FIG. 7, when the temperature of the plasma display panel rises to a high temperature higher than the normal temperature, such a sustain pulse is generated as shown in (a). The amount of sustain light generated is relatively reduced compared to room temperature (b). This is caused by an increase in the rate at which the wall charges recombine with the space charges in the discharge cell as described with reference to FIG. 6, thereby decreasing the amount of wall charge in the discharge cell.

Accordingly, there is a problem that the luminance of the plasma display panel is reduced.

In addition, when the temperature of the plasma display panel falls to a low temperature lower than the normal temperature when the sustain time of the sustain voltage of the sustain pulse is maintained as shown in FIG. 7, the sustain pulse is generated as shown in (c). The magnitude of the sustain light is relatively increased compared to room temperature (b). This is caused by a decrease in the rate at which the wall charges recombine with the space charges in the discharge cell as described with reference to FIG. 6, and thus an excessive increase in the amount of wall charges in the discharge cell.

As a result, the brightness of the plasma display panel increases rapidly, resulting in a problem of deterioration of image quality due to defective bright spots on the screen. In addition, if the amount of wall charge in the discharge cell is rapidly increased, the conventional sustain pulse is excessively increased after falling from the sustain voltage (Vs) to the ground level (GND) in the voltage drop period (ER-Down Time). Self Erase occurs due to the wall charge, thereby reducing the amount of wall charge in the discharge cell. Accordingly, when the next sustain pulse is supplied, there is a problem that the amount of wall charge in the discharge cell is insufficient, so that the magnitude of the sustain light generated by the next sustain pulse is reduced or even the sustain discharge does not occur. As a result, the image quality of the plasma display panel is deteriorated.

In order to solve this problem, the present invention provides a plasma display device and a method of driving the plasma display panel which prevents mis-discharge according to temperature by adjusting the sustain time of the sustain voltage (Vs) of the sustain pulse according to the temperature of the plasma display panel. Its purpose is to.

The plasma display apparatus of the present invention for achieving the above object is controlled during the sustain period by controlling the plasma display panel including a plurality of scan electrodes and sustain electrodes, a driver and a driver for driving the plurality of scan electrodes and sustain electrodes And a sustain pulse controller configured to adjust a sustain voltage (Vs) holding time of the sustain pulse supplied to at least one of the electrode and the sustain electrode according to the temperature of the plasma display panel.

In addition, the sustain pulse controller controls the sustain voltage holding time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period at a high temperature of the plasma display panel higher than room temperature, and longer than the normal temperature of the plasma display panel. When the temperature is lower than the room temperature, the sustain voltage holding time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period is shorter than the room temperature.

In addition, the sustain pulse controller is characterized in that the sustain voltage holding time of the sustain pulse has three or more different values different from each other.

In addition, the sustain pulse controller is characterized in that the difference in the sustain voltage holding time between the sustain pulses having different sustain voltage holding time is the same.

The sustain pulse control unit may determine that the plasma display panel is a high temperature when the temperature of the plasma display panel is higher than or equal to a preset high temperature threshold temperature, and the low temperature when the plasma display panel is lower than or equal to a preset low temperature threshold temperature.

In addition, the high temperature critical temperature is characterized in that 60 ℃.

In addition, the low temperature critical temperature is characterized in that 20 ℃.

The sustain pulse controller may be configured to supply the sustain pulse to the scan electrode and the sustain electrode during the sustain period, and to superimpose the sustain pulse supplied to the scan electrode and the sustain pulse supplied to the sustain electrode during the sustain period.

In addition, the sustain pulse controller is characterized in that the supply cycle of the pair of sustain pulses overlapping each other is kept constant regardless of the temperature of the plasma display panel.

In addition, the sustain pulse controller may maintain the voltage rising time and the voltage falling time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period regardless of the temperature of the plasma display panel.

In addition, the present invention for achieving the above object is a method of driving a plasma display panel comprising a plurality of scan electrodes and sustain electrodes, the sustain voltage of the sustain pulse supplied to at least one of the scan electrode or the sustain electrode during the sustain period ( Vs) the holding time is adjusted according to the temperature of the plasma display panel.

In addition, when the temperature of the plasma display panel is higher than room temperature, the sustain voltage holding time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period is longer than room temperature, and the temperature of the plasma display panel is lower than room temperature. At low temperatures, the sustain voltage holding time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period is shorter than room temperature.

In addition, the sustain voltage holding time of the sustain pulse is characterized by having three or more different values different from each other.

Further, the difference in the sustain voltage holding time between the sustain pulses having different sustain voltage holding time is all the same.

In addition, the high temperature is a case where the temperature of the plasma display panel is greater than or equal to the preset high temperature threshold temperature, and the low temperature is a case where the temperature of the plasma display panel is less than or equal to the preset low temperature threshold temperature.

In addition, the high temperature critical temperature is characterized in that 60 ℃.

In addition, the low temperature critical temperature is characterized in that 20 ℃.

In addition, the sustain pulse is supplied to the scan electrode and the sustain electrode, respectively, during the sustain period, and the sustain pulse supplied to the scan electrode and the sustain pulse supplied to the sustain electrode are overlapped.

In addition, the supply period of the pair of sustain pulses overlapping each other may be kept constant regardless of the temperature of the plasma display panel.

In addition, the voltage rise time and the voltage fall time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period are maintained regardless of the temperature of the plasma display panel.

Hereinafter, exemplary embodiments of a plasma display apparatus and a method of driving a plasma display panel of the present invention will be described in detail with reference to the accompanying drawings.

8 is a view for explaining the structure of the plasma display device of the present invention.

As shown in FIG. 8, the plasma display apparatus of the present invention includes scan electrodes Y ₁ to Yn and sustain electrodes Z, and a plurality of address electrodes X ₁ to X that intersect the scan electrodes and sustain electrodes Z. As shown in FIG. Xm) and at least one subfield to which a driving pulse is applied to the address electrodes X ₁ to Xm, the scan electrodes Y ₁ to Yn, and the sustain electrode Z in the reset period, the address period and the sustain period. A combination of a plasma display panel 800 representing a frame-shaped image, a data driver 802 for supplying data to address electrodes X ₁ to Xm formed on the plasma display panel 800, and a scan electrode Scan driver 803 for driving the fields Y ₁ to Yn, a sustain driver 804 for driving the sustain electrodes Z serving as the common electrode, and the scan driving described above in the sustain period. And a sustain pulse controller 801 for controlling the unit 803 and the sustain driver 804.

Here, the aforementioned plasma display panel 800 is bonded to the front panel (not shown) and the rear panel (not shown) at regular intervals, and a plurality of electrodes, for example, scan electrodes (Y ₁ to Yn) and sustain. A plurality of sustain electrodes including the electrodes Z are formed, and the address electrodes X ₁ through Xm are formed to intersect the sustain electrodes including the scan electrodes Y ₁ to Yn and the sustain electrode Z. do.

The scan driver 803 supplies the rising ramp waveform Ramp-up to the scan electrodes Y ₁ to Yn during the setup period of the reset period under the control of a timing controller (not shown), and also during the set down period of the reset period. The falling ramp waveform Ramp-down is supplied to the scan electrodes Y ₁ to Yn. In addition, the scan driver 803 sequentially supplies the scan pulse Sp of the scan voltage (-Vy) to the scan electrodes Y ₁ to Yn during the address period, and controls the sustain pulse controller 801 during the sustain period. Accordingly, the sustain pulse SUS is supplied to the scan electrodes Y ₁ to Yn.

The sustain driver 804 supplies the bias voltage Vz to the sustain electrodes Z during one or more of a set down period or an address period under the control of a timing controller (not shown), and controls the sustain pulse controller 801 in the sustain period. In operation, the scan driver 803 alternately operates to supply the sustain pulse SUS to the sustain electrodes Z.

The data driver 801 is subjected to inverse gamma correction and error diffusion by an inverse gamma correction circuit, an error diffusion circuit, and the like, and then is supplied with image data mapped to each subfield by a subfield mapping circuit. The field-mapped image data is supplied to the corresponding address electrode X, respectively.

The sustain pulse controller 801 controls the operations of the scan driver 803 and the sustain driver 804 described above in the sustain period. In particular, the sustain pulse controller 801 described above includes the scan driver 803 and the sustain driver ( 804 is controlled to adjust the sustain voltage Vs holding time of the sustain pulse supplied to at least one of the scan electrode Y and the sustain electrode Z during the sustain period according to the temperature of the plasma display panel 800.

The operation of the plasma display device of the present invention having such a structure will be more clearly understood through the following description of the method of driving the plasma display panel.

9 is a view for explaining an embodiment of a method of driving a plasma display panel of the present invention.

Referring to FIG. 9, the length of a sustain time of the sustain voltage Vs of the sustain pulse supplied to at least one of the scan electrode Y and the sustain electrode Z during the sustain period is adjusted according to the temperature of the plasma display panel.

Preferably, when the temperature of the plasma display panel is higher than room temperature, the length of the sustain voltage holding time of the sustain pulse supplied to at least one of the scan electrode Y or the sustain electrode Z during the sustain period is longer than the room temperature. At low temperatures where the temperature of the plasma display panel is lower than room temperature, the sustain time of the sustain voltage of the sustain pulse supplied to at least one of the scan electrode Y or the sustain electrode Z during the sustain period is shorter than room temperature.

For example, as shown in FIG. 9, the sustain pulse supplied to at least one of the scan electrode Y and the sustain electrode Z at room temperature reaches the sustain voltage Vs from time t ₃ to t _6. Keep up to the point. That is, the sustain voltage holding time W2 of the sustain pulse is t ₆ -t ₃ at room temperature. In addition, the sustain pulse supplied to at least one of the scan electrode (Y) or the sustain electrode (Z) at a high temperature above the room temperature of the plasma display panel reaches a sustain voltage at time t ₂ and is maintained until time t ₇ . . That is, the sustain voltage holding time W1 of the sustain pulse at high temperature is t ₇ -t ₂ . In addition, the sustain pulse supplied at a lower temperature than the aforementioned room temperature of the plasma display panel reaches the sustain voltage at time t ₄ and is maintained until time t ₅ . That is, the sustain voltage holding time W3 of the sustain pulse at low temperature is t ₅ -t ₄ .

As such, the sustain voltage holding time of the sustain pulse is preferably longer as the temperature of the plasma display panel increases, and shorter as the temperature of the plasma display panel decreases.

In addition, the voltage rise time (ER-Up Time) and voltage fall time (ER-Down Time) of the sustain pulse are as follows.

That is, when the plasma display panel is at a high temperature, the sustain pulse supplied to at least one of the scan electrode Y or the sustain electrode Z in the sustain period starts to rise at the time t ₁ and is the highest point at the time t _2. The sustain voltage (Vs) is reached. That is, the voltage rise time of the sustain pulse at high temperature is t ₂ -t ₁ . Also, the voltage drop time is t ₈ -t ₇ .

When the temperature of the plasma display panel is at room temperature, the sustain pulse supplied to at least one of the scan electrode Y or the sustain electrode Z in the sustain period starts to rise at the time t ₂ and the highest point at the time t ₃ , that is, the sustain voltage. (Vs) is reached. That is, the voltage rise time of the sustain pulse at room temperature is t ₃ -t ₂ . Also, the voltage drop time is t ₇ -t ₆ .

When the temperature of the plasma display panel is low, the sustain pulse supplied to at least one of the scan electrode Y or the sustain electrode Z in the sustain period starts to rise at time t ₃ , the highest point at time t ₄ , that is, the sustain voltage. (Vs) is reached. That is, the voltage rise time of the sustain pulse at low temperature is t ₄ -t ₃ . Also, the voltage drop time is t ₆ -t ₅ .

Here, in all cases where the temperature of the above-described plasma display panel is high temperature, room temperature, and low temperature, it is preferable that the voltage rise time of the sustain pulse is the same, and the voltage fall time of the sustain pulse is the same.

As such, the voltage drop time and the voltage rise time of the sustain pulse supplied to at least one of the scan electrode Y or the sustain electrode Z are maintained constant regardless of the temperature of the plasma display panel during the sustain period.

As described above, in one embodiment of the driving method of the plasma display panel of the present invention, the sustain voltage holding time of the sustain pulse is lengthened as the plasma display panel increases in temperature, and the plasma display panel is shortened as the temperature falls. In order to prevent the mis-discharge according to the temperature and to prevent the self-erase discharge, this will be described with reference to FIG. 10.

FIG. 10 is a view for explaining an optical characteristic according to temperature caused by the driving waveform of FIG. 9.

Referring to FIG. 10, a sustain pulse supplied to at least one of the scan electrode Y or the sustain electrode Z in the sustain period is shown in the case where the temperature of the plasma display panel is high and low compared with FIG. 7. The amount of light generated by the same is the same as when the temperature of the plasma display panel is room temperature.

As described above, the reason why the amount of light generated by one sustain pulse at a high temperature higher than room temperature and the amount of light generated by one sustain pulse at a low temperature lower than room temperature is the same as the room temperature. same.

That is, as shown in (a), when the temperature of the plasma display panel is higher than room temperature, the sustain voltage holding time of the sustain pulse supplied to one or more electrodes of the scan electrode Y or the sustain electrode Z in the sustain period is higher than at room temperature. That is, by making it longer than (b), the amount of wall charges accumulated in the discharge cells by one sustain pulse is increased. Accordingly, the magnitude of the sustain light generated by the next sustain pulse increases. As a result, when the temperature of the plasma display panel is higher than room temperature, the rate at which wall charges recombine with the space charges in the discharge cell increases, so that even if the amount of wall charges in the discharge cell decreases, By increasing the amount, the magnitude of the sustain light generated by one sustain pulse is increased.

Accordingly, as shown in FIG. 7A, the rate at which wall charges in the discharge cells recombine with the space charges is increased at a high temperature of the plasma display panel higher than room temperature, thereby increasing wall charges in the discharge cells. The problem of erroneous discharge caused by decreasing the amount of?, I.e., the magnitude of the sustain light generated by one sustain pulse is reduced so that the luminance does not decrease or even sustain discharge does not occur.

In addition, as shown in (c), at a low temperature at which the plasma display panel is lower than room temperature, the sustain voltage holding time of the sustain pulse supplied to at least one electrode of the scan electrode Y or the sustain electrode Z in the sustain period is higher than at room temperature. That is, by making it shorter than (b), the amount of wall charges accumulated in the discharge cells by one sustain pulse is reduced. Accordingly, the magnitude of the sustain light generated by the next sustain pulse is reduced. As a result, when the temperature of the plasma display panel is lower than room temperature, the ratio of wall charges recombining with the space charges in the discharge cell is decreased, so that the sustain voltage even though the amount of wall charges in the discharge cell is relatively high. By reducing the amount of wall charges in the discharge cells with a sustain pulse having a relatively short sustain time, the magnitude of the sustain light generated by one sustain pulse is reduced.

Accordingly, as shown in FIG. 7C, the rate at which the wall charges in the discharge cells recombine with the space charges at a low temperature of the plasma display panel lower than room temperature is reduced, thereby reducing the wall charges in the discharge cells. The problem of mis-discharge caused by the formation of a relatively large amount of, i.e., the amount of sustain light generated by one sustain pulse is excessively increased, resulting in poor bright spots on the screen and deteriorating image quality.

Furthermore, by maintaining the sustain time (Vs) of the sustain pulse relatively short at a low temperature of the plasma display panel lower than room temperature, the wall charges excessively formed in the discharge cells when the temperature of the plasma display panel is low temperature are relatively short. After the sustain pulse falls from the sustain voltage (Vs) to the ground level (GND) in the voltage drop period (ER-Down Time), a self erase discharge occurs and the amount of wall charge in the discharge cell The problem of reducing the problem does not occur. In other words, when the plasma display panel is at a lower temperature than the room temperature, the sustain period is reduced even when the amount of wall charges in the discharge cells recombines with the space charges and the amount of wall charges in the discharge cells is excessively increased. Since the sustain voltage holding time of the sustain pulse supplied to at least one of the sustain electrode Z or the scan electrode Y is set to be shorter than in the related art, the sustain pulse is separated from the sustain voltage Vs in the voltage drop period. Since the distribution of the wall charges in the discharge cells is stabilized even after descending to the ground level GND, self erase discharge does not occur.

In one embodiment of the method of driving the plasma display panel of the present invention, when the sustain voltage holding time of the sustain pulse is adjusted according to the temperature of the plasma display panel, the threshold temperature of the plasma display panel is set in advance, and the set threshold is set. It is preferable to adjust the sustain voltage holding time of the sustain pulse in accordance with the temperature. This will be described below with reference to FIGS. 11 to 12.

First, referring to FIG. 11, FIG. 11 is a view for explaining an example of a method for setting a threshold temperature in the method of driving a plasma display panel. An example of setting two threshold temperatures of a plasma display panel is shown. .

For example, as shown in FIG. 11, the threshold temperatures of the plasma display panel are set to 20 ° C and 60 ° C. That is, the high temperature critical temperature of the plasma display panel is set to 60 ° C, and the low temperature critical temperature of the plasma display panel is set to 20 ° C.

Thus, the threshold temperature is set and the sustain voltage holding time of the sustain pulse supplied to the scan electrode Y or the sustain electrode Z in the sustain period is adjusted as the set threshold temperature. For example, when the temperature of the plasma display panel falls below a low temperature threshold temperature, for example, 20 ° C. as shown in FIG. 11, the sustain pulse controller of reference numeral 801 of FIG. 8 senses that the temperature of the plasma display panel is low temperature, and sustain In the period of time, the sustain voltage holding time of the sustain pulse supplied to at least one of the scan electrodes Y and the sustain electrodes Z is shorter than room temperature. That is, the sustain voltage holding time of the sustain pulse is set to (W3, t _5- t ₄ ) which is shorter than the voltage rise time (W2, t _6- t ₃ ) of the sustain pulse at room temperature.

For example, when the temperature of the plasma display panel rises to a high temperature threshold temperature, for example, 60 ° C. or more, as shown in FIG. 11, the sustain pulse controller of reference numeral 801 of FIG. 8 senses that the temperature of the plasma display panel is high temperature. In the sustain period, the sustain voltage holding time of the sustain pulse supplied to at least one of the scan electrode Y and the sustain electrode Z is longer than room temperature. That is, the sustain voltage holding time of the sustain pulse is set to (W1, t ₇ -t ₂ ) longer than the sustain voltage holding time (W2, t _6- t ₃ ) of the sustain pulse at room temperature.

That is, the sustain voltage holding time of the sustain pulse is to have three or more different values different from each other.

In this way, it is also possible to make the sustain voltage holding time of the sustain pulse have six different values, which is shown in FIG.

12 is a view for explaining an example of another method of setting the threshold temperature in the method of driving the plasma display panel of the present invention.

Referring to FIG. 12, unlike the case of FIG. 11, five threshold temperatures of the plasma display panel are set.

For example, as shown in FIG. 12, the threshold temperatures of the plasma display panel are set to 20 ° C, 30 ° C, 40 ° C, 50 ° C, and 60 ° C.

Thus, the threshold temperature is set and the sustain voltage holding time of the sustain pulse supplied to the scan electrode Y or the sustain electrode Z in the sustain period is adjusted as the set threshold temperature. For example, when the temperature of the plasma display panel drops below 20 ° C as shown in FIG. 12, the sustain pulse controller of reference numeral 801 of FIG. 8 detects this, and the scan electrode Y or the sustain electrode Z in the sustain period. Adjust the sustain voltage holding time of the sustain pulse supplied to one or more of the electrodes, for example, set the sustain voltage holding time to (t ₈ -t ₇ ).

For example, when the temperature of the plasma display panel is greater than 20 ° C. and less than 30 ° C. as shown in FIG. 12, the sustain pulse controller of reference numeral 801 of FIG. 8 detects this, and the scan electrode Y or the sustain in the sustain period is detected. The sustain voltage holding time of the sustain pulse supplied to one or more of the electrodes Z is adjusted. For example, the sustain voltage holding time of the sustain pulse is set to (t ₉ -t ₆ ).

In this way, when the temperature of the plasma display panel is above 30 ° C and below 40 ° C, the sustain voltage holding time of the sustain pulse is set to (t ₁₀ -t ₅ ), and the temperature of the plasma display panel is above 40 ° C and below 50 ° C. In this case, the sustain voltage holding time of the sustain pulse is set to (t ₁₁ -t ₄ ), and the sustain voltage holding time of the sustain pulse is set to (t ₁₂ −) when the temperature of the plasma display panel is greater than 50 ° C. and less than 60 ° C. t ₃ ), and when the temperature of the plasma display panel exceeds 60 ° C., the sustain voltage holding time of the sustain pulse is set to (t ₁₃ −t ₂ ).

In this manner, when the threshold temperature of the plasma display panel is set to three or more, misdischarges due to temperature can be more easily prevented.

The difference between the sustain voltage holding times of the sustain pulses in the respective temperature ranges in Figs. 11 to 12 may be set identically or differently. However, it is preferable that all of the differences between the sustain voltage holding times are the same when considering the control aspect of the driving circuit.

In one embodiment of the driving method of the plasma display panel of the present invention described above, the plasma display panel excessively sustains the sustain voltage holding time of the sustain pulse supplied to the scan electrode (Y) or the sustain electrode (Z) in the sustain period according to the temperature. Increasing or decreasing the number of sustain pulses included in one sustain period may vary. In order to prevent the number of sustain pulses included in one sustain period from being changed, it is preferable that the sustain pulses supplied to the scan electrode Y and the sustain pulses supplied to the sustain electrode Z overlap. This will be described with reference to FIG. 13.

FIG. 13 is a view for explaining that the sustain pulse supplied to the scan electrode and the sustain pulse supplied to the sustain electrode overlap each other in the driving method of the plasma display panel according to the present invention.

Referring to FIG. 13, in the sustain period, the sustain pulse is supplied to both the scan electrode Y and the sustain electrode Z, and the sustain pulse supplied to the scan electrode Y and the sustain pulse Z are supplied to the scan electrode Y. Overlap each other.

In addition, it is preferable that the supply period of the pair of sustain pulses overlapping each other is kept constant regardless of the temperature of the plasma display panel, which will be described with reference to FIG. 14.

14 is a diagram for explaining a period of a pair of overlapping sustain pulses.

Referring to FIG. 14, when the temperature of the plasma display panel is room temperature, the sustain time of the sustain voltage Vs of the sustain pulse supplied to the scan electrode Y and the sustain electrode Z in the sustain period is W2, and the scan is performed. The sustain pulse supplied to the electrode Y and the sustain pulse supplied to the sustain electrode Z overlap. The period of the pair of sustain pulses superimposed in this manner is T when the temperature of the plasma display panel is room temperature.

In addition, when the temperature of the plasma display panel is higher than room temperature, the sustain time of the sustain voltage Vs of the sustain pulse supplied to the scan electrode Y and the sustain electrode Z in the sustain period is the same as the above-mentioned normal temperature ( W1 longer than W2) and the sustain pulse supplied to the scan electrode Y and the sustain pulse supplied to the sustain electrode Z overlap. The period of the pair of sustain pulses superimposed in this manner is the same T as when the temperature of the plasma display panel is room temperature.

In addition, when the temperature of the plasma display panel is lower than the room temperature, the sustain time of the sustain voltage Vs of the sustain pulse supplied to the scan electrode Y and the sustain electrode Z in the sustain period is the same as the above-mentioned room temperature ( It is W3 shorter than W2), and the sustain pulse supplied to the scan electrode Y and the sustain pulse supplied to the sustain electrode Z overlap each other. The period of the pair of sustain pulses superimposed in this manner is the same T as when the temperature of the plasma display panel is room temperature.

That is, as described above, the supply period of the pair of sustain pulses overlapping each other is kept constant regardless of the temperature of the plasma display panel.

When the sustain pulses supplied to the scan electrode Y and the sustain pulses supplied to the sustain electrode Z overlap each other, the number of the sustain pulses included in the predetermined sustain period even if the sustain voltage holding time of the sustain pulses is excessively changed. You can keep it constant.

In addition, when the sustain pulse supplied to the scan electrode Y and the sustain pulse supplied to the sustain electrode Z overlap, the sustain discharge is stabilized and a relatively large sustain pulse having a relatively short sustain voltage holding time is used. It can generate sustain light.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the foregoing description, and the meaning and scope of the claims. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above in detail, the present invention adjusts the sustain voltage holding time of the sustain pulse supplied to at least one of the sustain electrode and the scan electrode in the sustain period according to the temperature of the plasma display panel, thereby preventing mis-discharge according to temperature. It is effective to prevent deterioration of image quality.

Claims (20)

A plasma display panel including a plurality of scan electrodes and a sustain electrode; A driver for driving the plurality of scan electrodes and the sustain electrodes; And A sustain pulse controller controlling the driving unit to adjust a sustain voltage (Vs) holding time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period according to the temperature of the plasma display panel; Plasma display device comprising a. The method of claim 1, The sustain pulse control unit When the temperature of the plasma display panel is higher than room temperature, the sustain voltage holding time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period is longer than room temperature, and the temperature of the plasma display panel is increased. And a sustain voltage holding time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period is shorter than room temperature at a low temperature lower than room temperature. The method of claim 2, The sustain pulse control unit And a sustain voltage holding time of the sustain pulse to have at least three different values different from each other. The method of claim 3, wherein The sustain pulse control unit And the difference in sustain voltage holding time between the sustain pulses having different sustain voltage holding time is the same. The method of claim 2, The sustain pulse control unit And determining the high temperature when the temperature of the plasma display panel is higher than or equal to a preset high temperature threshold temperature, and determining the low temperature when the temperature of the plasma display panel is lower than or equal to a preset low temperature threshold temperature. The method of claim 5, The high temperature critical temperature is 60 ℃ plasma display device. The method of claim 5, The low temperature threshold temperature is 20 ℃ plasma display device. The method of claim 2, The sustain pulse control unit The sustain pulse may be supplied to the scan electrode and the sustain electrode respectively during the sustain period, and the sustain pulse supplied to the scan electrode and the sustain pulse supplied to the sustain electrode overlap each other during the sustain period. Plasma display device. The method of claim 8, The sustain pulse control unit And a supply period of the pair of sustain pulses overlapping each other is kept constant regardless of the temperature of the plasma display panel. The method of claim 2, The sustain pulse control unit Regardless of the temperature of the plasma display panel, the voltage rise time and the voltage fall time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period are maintained to be constant, respectively. . In the driving method of a plasma display panel including a plurality of scan electrodes and a sustain electrode, And a sustain voltage (Vs) holding time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period is adjusted according to the temperature of the plasma display panel. The method of claim 11, When the temperature of the plasma display panel is higher than room temperature, the sustain voltage holding time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period is longer than room temperature, and the temperature of the plasma display panel is room temperature. And at a lower temperature, the sustain voltage holding time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period is shorter than room temperature. The method of claim 12, And a sustain voltage holding time of the sustain pulse has three or more different values different from each other. The method of claim 13, And the difference in sustain voltage holding time between the sustain pulses having different sustain voltage holding time is the same. The method of claim 12, Wherein the high temperature is a case where the temperature of the plasma display panel is greater than or equal to a preset high temperature threshold temperature, and the low temperature is a case where the temperature of the plasma display panel is less than or equal to a preset low temperature threshold temperature. The method of claim 15, The high temperature threshold temperature is 60 ℃ driving method of the plasma display panel. The method of claim 15, The low temperature threshold temperature is 20 ℃ driving method of the plasma display panel. The method of claim 12, Wherein the sustain pulse is supplied to the scan electrode and the sustain electrode during the sustain period, and the sustain pulse supplied to the scan electrode and the sustain pulse supplied to the sustain electrode overlap each other during the sustain period. How to drive the panel. The method of claim 18, And a supply period of the pair of sustain pulses overlapping each other is kept constant regardless of the temperature of the plasma display panel. The method of claim 12, Regardless of the temperature of the plasma display panel, the voltage rise time and the voltage fall time of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode during the sustain period are maintained constant, respectively. Driving method.

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